Steering System Segmented Electric Motors Redundancy
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Solution Overview
Problem
Existing electro-hydraulic steering systems for motor vehicles face challenges with large installation space requirements, high complexity, and difficulties in standardization and flexibility due to the need for redundant hydraulic and electric components.
Innovation Solution
The steering system employs two hydraulic pumps and two electric motors, with each motor and pump optimized for their specific application, allowing for smaller, more flexible components and enabling standardization across different vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one electric motor with two windings is used for redundancy, then reliability is improved, but the motor size and installation space requirements increase
Solution Approach 1:
The single motor with dual windings is segmented into two separate motors, each with a single winding. This allows the redundancy function to be distributed across two smaller units rather than concentrated in one larger unit, resolving the contradiction between reliability and installation space.
Solution Approach 2:
Instead of adding a second winding to the first motor, the system uses a second motor that copies the essential function of the first. This copying approach allows for smaller individual components while maintaining system redundancy.
2Reliability
If one electric motor with two windings is used for redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The complex dual-winding motor is segmented into two simpler single-winding motors. This segmentation reduces the complexity of each individual motor while maintaining the redundancy function at the system level.
Solution Approach 2:
The redundant winding is extracted from the first motor and implemented as a separate second motor. This extraction simplifies the first motor to a standard single-winding design while achieving the same redundancy effect through system architecture.
3Reliability
If one electric motor with two windings is used, then redundancy is achieved, but electromagnetic compatibility protection becomes more complex
Solution Approach 1:
The electromagnetic compatibility protection is segmented from the motor level to the system level. Each motor requires protection for a single winding, which is simpler than protecting two windings in one motor. The overall system maintains redundancy while reducing individual component complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the overall size of the steering system, enhances installation flexibility, and improves efficiency by allowing for optimized performance of each component, while also providing a redundant emergency supply.
Implementation Method 1
a first electric motor for the main supply of the steering gear and a second electric motor for the emergency supply of the steering gear
Implementation Method 2
a first hydraulic pump driven by a first electric motor for the main supply of the steering gear and a second hydraulic pump driven by a second electric motor for the emergency supply of the steering gear
Data Source
Figure 1
AI summary
A steering system (1) for a motor vehicle has the following features: - a steering gear (2) operated with a hydraulic medium, - a first hydraulic pump (4) driven by a first electric motor (3) for the main supply of the steering gear (2), - a second hydraulic pump (6) driven by a second electric motor (5) for the emergency supply of the steering gear (2).